Online and telemarketing donations have a unique feature that few other direct-marketing interactions have: You still are communicating with donors once they have made their donations.
Obviously, a large part of this post-donation interaction should be aimed at confirming that the donation was made and sincerely thanking the person for contributing to the cause.
But there is a unique opportunity in these interactions to get additional value from and give additional value to your donors; it’s the time between donation and processing. A person has selected an amount, given his or her credit card (or EFT) information, and decided to make the donation (whether online or by phone). But the person or the series of tubes has not yet processed the credit card.